A 70-kg man is walking at a speed of 2.0 m/s. What is his kinetic energy (energy is measured in Joules)?
hvy
To calculate the kinetic energy of an object, you need to use the formula:
Kinetic Energy (KE) = 0.5 * mass * velocity^2
Given:
Mass (m) = 70 kg
Velocity (v) = 2.0 m/s
Let's substitute these values into the formula and calculate the kinetic energy:
KE = 0.5 * 70 kg * (2.0 m/s)^2
First, let's square the velocity:
KE = 0.5 * 70 kg * (4.0 m^2/s^2)
Next, let's multiply the mass by the squared velocity:
KE = 0.5 * 70 kg * 4.0 m^2/s^2
KE = 140 kg * m^2/s^2
Therefore, the kinetic energy of the 70-kg man walking at a speed of 2.0 m/s is 140 Joules.
To calculate the kinetic energy of an object, you need to use the formula: KE = 0.5 * mass * velocity^2.
In this case, the mass of the man is given as 70 kg, and the velocity at which he is walking is 2.0 m/s. Now we can substitute these values into the formula to find the answer.
KE = 0.5 * 70 kg * (2.0 m/s)^2
First, we square the velocity: (2.0 m/s)^2 = 4.0 m^2/s^2.
Then we multiply the squared velocity by the mass: 0.5 * 70 kg * 4.0 m^2/s^2 = 140 Joules.
Therefore, the kinetic energy of the man is 140 Joules.
recall that KE = 1/2 mv^2
so just plug in your numbers as given, since they are in the right units.
J = kg-m^2/s^2